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151 lines
5.4 KiB
C
151 lines
5.4 KiB
C
/*
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FreeRTOS.org V5.0.3 - Copyright (C) 2003-2008 Richard Barry.
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This file is part of the FreeRTOS.org distribution.
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FreeRTOS.org is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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FreeRTOS.org is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with FreeRTOS.org; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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A special exception to the GPL can be applied should you wish to distribute
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a combined work that includes FreeRTOS.org, without being obliged to provide
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the source code for any proprietary components. See the licensing section
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of http://www.FreeRTOS.org for full details of how and when the exception
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can be applied.
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***************************************************************************
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***************************************************************************
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* *
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* SAVE TIME AND MONEY! We can port FreeRTOS.org to your own hardware, *
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* and even write all or part of your application on your behalf. *
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* See http://www.OpenRTOS.com for details of the services we provide to *
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* expedite your project. *
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* *
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***************************************************************************
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***************************************************************************
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Please ensure to read the configuration and relevant port sections of the
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online documentation.
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http://www.FreeRTOS.org - Documentation, latest information, license and
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contact details.
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http://www.SafeRTOS.com - A version that is certified for use in safety
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critical systems.
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http://www.OpenRTOS.com - Commercial support, development, porting,
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licensing and training services.
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*/
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/**
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* Creates eight tasks, each of which flash an LED at a different rate. The first
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* LED flashes every 125ms, the second every 250ms, the third every 375ms, etc.
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*
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* The LED flash tasks provide instant visual feedback. They show that the scheduler
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* is still operational.
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*
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* The PC port uses the standard parallel port for outputs, the Flashlite 186 port
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* uses IO port F.
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*
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* \page flashC flash.c
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* \ingroup DemoFiles
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* <HR>
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*/
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/*
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Changes from V2.0.0
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+ Delay periods are now specified using variables and constants of
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portTickType rather than unsigned portLONG.
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Changes from V2.1.1
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+ The stack size now uses configMINIMAL_STACK_SIZE.
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+ String constants made file scope to decrease stack depth on 8051 port.
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*/
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#include <stdlib.h>
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/* Scheduler include files. */
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#include "FreeRTOS.h"
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#include "task.h"
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/* Demo program include files. */
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#include "partest.h"
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#include "flash.h"
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#include "print.h"
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#define ledSTACK_SIZE configMINIMAL_STACK_SIZE
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/* Structure used to pass parameters to the LED tasks. */
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typedef struct LED_PARAMETERS
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{
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unsigned portBASE_TYPE uxLED; /*< The output the task should use. */
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portTickType xFlashRate; /*< The rate at which the LED should flash. */
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} xLEDParameters;
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/* The task that is created eight times - each time with a different xLEDParaemtes
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structure passed in as the parameter. */
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static void vLEDFlashTask( void *pvParameters );
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/* String to print if USE_STDIO is defined. */
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const portCHAR * const pcTaskStartMsg = "LED flash task started.\r\n";
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/*-----------------------------------------------------------*/
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void vStartLEDFlashTasks( unsigned portBASE_TYPE uxPriority )
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{
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unsigned portBASE_TYPE uxLEDTask;
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xLEDParameters *pxLEDParameters;
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const unsigned portBASE_TYPE uxNumOfLEDs = 8;
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const portTickType xFlashRate = 125;
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/* Create the eight tasks. */
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for( uxLEDTask = 0; uxLEDTask < uxNumOfLEDs; ++uxLEDTask )
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{
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/* Create and complete the structure used to pass parameters to the next
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created task. */
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pxLEDParameters = ( xLEDParameters * ) pvPortMalloc( sizeof( xLEDParameters ) );
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pxLEDParameters->uxLED = uxLEDTask;
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pxLEDParameters->xFlashRate = ( xFlashRate + ( xFlashRate * ( portTickType ) uxLEDTask ) );
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pxLEDParameters->xFlashRate /= portTICK_RATE_MS;
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/* Spawn the task. */
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xTaskCreate( vLEDFlashTask, "LEDx", ledSTACK_SIZE, ( void * ) pxLEDParameters, uxPriority, ( xTaskHandle * ) NULL );
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}
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}
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/*-----------------------------------------------------------*/
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static void vLEDFlashTask( void *pvParameters )
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{
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xLEDParameters *pxParameters;
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/* Queue a message for printing to say the task has started. */
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vPrintDisplayMessage( &pcTaskStartMsg );
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pxParameters = ( xLEDParameters * ) pvParameters;
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for(;;)
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{
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/* Delay for half the flash period then turn the LED on. */
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vTaskDelay( pxParameters->xFlashRate / ( portTickType ) 2 );
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vParTestToggleLED( pxParameters->uxLED );
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/* Delay for half the flash period then turn the LED off. */
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vTaskDelay( pxParameters->xFlashRate / ( portTickType ) 2 );
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vParTestToggleLED( pxParameters->uxLED );
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}
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}
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